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How to Install a Chimney Liner

How to Install a Chimney Liner

Jun 19th 2020

This Article has been approved by our on staff NFI Certified Specialists & Master Hearth Professionals

Chimney liners are all fuel venting systems that are intended for use with heating appliances vented through a masonry chimney. Before installing your chimney liner be sure to perform the following tasks:

  • Clear your chimney of any obstructions and debris.

  • Hire a sweep to clean the chimney for you or clean it yourself.

  • Inspect your chimney. Look for cracked, loose or missing bricks or stones.

  • Measure your chimney. A chimney liner kit that will serve a fireplace needs to have the largest diameter pipe that will fit inside your flue, whereas the liner size required for other fuel burning appliances will be determined by the manufacturer’s specifications and local safety codes.

The basic measurements you need before you select a chimney liner kit are the height of your chimney and the inside dimensions of your existing flue. From the top of your chimney, measure to the top of the fireplace smoke chamber or the connection point for your wood stove or furnace.

For a fireplace, you should have a liner with a cross sectional area no less than one tenth of the area of the fireplace opening. This ten to one ratio is a rule of thumb that can vary depending upon the height of the chimney and other factors.

This is important for 2 reasons:

  • If the liner diameter is too small, your fireplace will not draw well, resulting in smoky fires and smoke-filled rooms

  • If the size of liner that you need for your fireplace is too large to fit inside your existing flue, you may need to repair your clay tile liner rather than inserting a steel liner inside it

Measuring liner infograph

Now that you've cleaned and inspected your chimney and figured out which liner kit you need, you can begin installing your liner. Follow these simple guidelines to install your chimney liner system:

chimney kit
Chimney Liner

The advantages to a chimney liner is improved draft by sizing the liner to the appliance, hotter core temperatures, improved safety, easier cleaning, and longevity.

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Once you have your chimney liner installed, it is strongly advised that you insulate. An insulated chimney not only has a better draft, it also stays cleaner longer. To insulate, pour a mixture of vermiculite and cement down the chimney in between the chimney liner and the chimney stone or brick. This will insulate the chimney, allowing it to heat more quickly, and allowing your stove to heat more effectively.

Chimney Liners are available in single-wall liner kits and smooth-wall liner kits. To see which one is best for you, follow the link below and compare both types of chimney liner.

which chimney liner is best for me
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